Product Distribution Communications
As mentioned in the previous section, products generated by the Radar Product Generator (RPG) are sent to users over various transmission lines. For most NWS CONUS offices with a dedicated connection to an RPG, the primary connections are high speed lines (AWIPS Local Area Network, or LAN, to NWS RPG LAN connection). For Department of Defense (DoD) and Federal Aviation Administration (FAA) users (or NWS users of DoD and FAA RPGs), the dedicated connection utilizes a Frame Relay circuit. NWS dial-up access for One-Time Requests (OTRs) and Radar Multiple Requests (RMRs) initiates at the AWIPS workstation and transmits through the AWIPS Wide Area Network (WAN).
Many additional users access the WSR-88D base data (i.e., Archive Level II) and national product list (i.e., Archive Level III) via other distribution methods. For instance, the base data are made available from the RPG, via the Archive II Data Distribution System (BDDS). These data transfer from the RPG, through WFO regional headquarters, and then through commercial communication lines to different sites where they become available for “Other Users.”
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